NO120754B - - Google Patents
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- Publication number
- NO120754B NO120754B NO16894867A NO16894867A NO120754B NO 120754 B NO120754 B NO 120754B NO 16894867 A NO16894867 A NO 16894867A NO 16894867 A NO16894867 A NO 16894867A NO 120754 B NO120754 B NO 120754B
- Authority
- NO
- Norway
- Prior art keywords
- contact knife
- knife
- contact
- recesses
- jacket
- Prior art date
Links
- 238000000034 method Methods 0.000 claims description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 5
- 239000010949 copper Substances 0.000 claims description 5
- 229910052802 copper Inorganic materials 0.000 claims description 5
- 208000000260 Warts Diseases 0.000 claims description 4
- 238000002844 melting Methods 0.000 claims description 4
- 230000008018 melting Effects 0.000 claims description 4
- 201000010153 skin papilloma Diseases 0.000 claims description 4
- 238000005476 soldering Methods 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 3
- 238000003780 insertion Methods 0.000 claims description 3
- 230000037431 insertion Effects 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 claims description 2
- 238000007373 indentation Methods 0.000 claims 1
- 239000000463 material Substances 0.000 description 3
- 238000005266 casting Methods 0.000 description 2
- 229910001369 Brass Inorganic materials 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 238000005219 brazing Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 238000010003 thermal finishing Methods 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Description
Hul kontaktkniv for lavspennings-smelteinnsatser for stor effekt. Hollow contact knife for low-voltage melting inserts for great effect.
Oppfinnelsen angår kontaktkniver for The invention relates to contact knives for
lavspenningssmelteinnsatser for stor effekt, low-voltage fuse inserts for high power,
hvor kniven består av et sømløst trukket where the knife consists of a seamless drawn
rør. tube.
For en stor del anvendes stadig kontaktkniver av massivt materiale, fortrinns-vis kobber. For små nominelle strømstyrker To a large extent, contact knives made of solid material, preferably copper, are still used. Nominal currents too small
er slike store ledertverrsnitt imidlertid ikke however, such large conductor cross-sections are not
nødvendige, så der ved anvendelse av hule necessary, so there when using hollow
kontaktkniver kan oppnås betydelige ma-terialbesparelser. Således er det f.eks. kjent contact knives, significant material savings can be achieved. Thus, it is e.g. known
å fremstille slike kontaktkniver av et flat-trykt messingrør og støtte dettes flanker to produce such contact knives from a flat-pressed brass tube and support its flanks
med vorte-formede bulninger. De således with wart-shaped bulges. They thus
fremstilte kontaktkniver blir så forbundet manufactured contact knives are then connected
med smelteinnsatsenes avslutningsplater with the end plates of the melting inserts
ved hårdlodd. by hard lot.
Det har nu vist seg at denne metode It has now been shown that this method
ikke fører til noe tilfredsstillende resultat does not lead to any satisfactory results
ved hule kontaktkniver av kobber. Ved in the case of hollow contact knives made of copper. By
hårdloddingsprosessen inntrer en oppmyk-ning av kontaktmaterialet, som ikke lar seg the brazing process causes a softening of the contact material, which does not yield
fjerne igjen ved bråkjøling eller annen ter-misk etterbehandling. For allikevel å kunne remove again by quenching or other thermal finishing. To still be able to
anvende slike kontaktkniver var man tvun-get til å støpe ut de indre hulrom med to use such contact knives, one had to cast out the inner cavities with them
kunstharpiks, kitt etc. Denne fremgangs-måte er imidlertid kostbar og upålitelig, da synthetic resin, putty etc. This method is, however, expensive and unreliable
de kjente utstøpningsmasser enten har for the known casting compounds either have for
lav temperaturfasthet eller smuldrer ved low temperature resistance or crumbles wood
de rystelser som forekommer i drift. the vibrations that occur in operation.
De nevnte mangler blir i henhold til The aforementioned deficiencies are in accordance with
oppfinnelsen avhjulpet ved at kontaktkniven, som er formet av et kobberrør, etter the invention remedied by the contact knife, which is formed from a copper tube, after
stedfunnen varmebehandling ved lodding spot heat treatment by soldering
eller sveising er gjort stivere ved jevn or welding is made stiffer by even
strekning av en andel av rørmantelen under bibehold av en vesentlig del av mantelens indre form. stretching of a part of the tube jacket while maintaining a significant part of the inner shape of the jacket.
Oppfinnelsestanken kan realiseres ved at kontaktknivens indre hulrom opprett-holdes ved hjelp av en under avstivningsprosessen innført, delt, men ikke ettergivende kjerne, bortsett fra en del hvor kjernen er forsynt med uttagninger. Strekningen av rørmantelen skjer ved inntrekning i kjernens uttagninger. Derved blir de indre veggpartier under deformasjonsprosessen fastholdt og bare de ytre rørmantelpartier jevnt strukket, så man ved denne defor-masjon oppnår å gjenopprette den opprin-nelige hårdhet. Er andelen av det strukne materiale valgt slik at der skjer en tilstrek-kelig herdning, så behøves der ingen ytter-ligere forholdsregler som f. eks. utstøpning av hulrommet etc. Man vil dog hensiktsmessig drive deformasjonen så langt at de gjennompregede deler berører hverandre i kontaktknivens indre og dermed medfører en ekstra avstøtning av flankene. The idea of the invention can be realized in that the contact knife's inner cavity is maintained by means of a split, but non-yielding core introduced during the stiffening process, except for a part where the core is provided with recesses. The stretching of the tube jacket takes place by drawing in the core's recesses. Thereby, the inner wall parts are retained during the deformation process and only the outer tube jacket parts are evenly stretched, so that through this deformation the original hardness is restored. If the proportion of the stretched material is chosen so that sufficient hardening takes place, then no further precautions such as e.g. casting of the cavity etc. One will, however, expediently drive the deformation so far that the impressed parts touch each other in the interior of the contact knife and thus cause an additional repulsion of the flanks.
På tegningen er vist et utførelsesek-sempel på oppfinnelsen. The drawing shows an embodiment of the invention.
Fig. 1 viser en del av en smelteinnsats Fig. 1 shows part of a melting insert
i sideriss, og in side view, and
fig. 2 enderiss av det samme, sett mot fig. 2 end views of the same, facing
avslutningsplaten. the closing plate.
Kontaktkniven 1 består av et kobber-rør og er fastgjort i avslutningsplaten 4 ved hårdlodd. For å oppnå en fornyet herdning av den ved varmebehandlingen opp-mykede kontaktkniv er der langs kontaktknivens innføringskant 2 anordnet en av-lang forsenknig 3, som hensiktsmessig strekker seg over tilnærmelsesvis % av kontaktknivens lengde. Forsenkningene 3 i de to sidevegger av kontaktkniven er preget inn så langt at de berører hverandre i kontaktknivens indre og dermed gir en ekstra The contact knife 1 consists of a copper tube and is fixed in the end plate 4 by hard soldering. In order to achieve a renewed hardening of the contact knife softened by the heat treatment, an oblong recess 3 is arranged along the contact knife's insertion edge 2, which appropriately extends over approximately % of the contact knife's length. The depressions 3 in the two side walls of the contact knife are embossed so far that they touch each other in the interior of the contact knife and thus provide an additional
avstøtning av sideveggene. repulsion of the side walls.
Det er også mulig å anordne flere vorteformede gjennompregninger, som like-ledes kan berøre hverandre i det indre av It is also possible to arrange several wart-shaped perforations, which can likewise touch each other in the interior of
kontaktkniven. Men det må påsees at der contact knife. But it must be ensured that there
blir strukket en så stor andel av rørman-telen at kontaktknivens herdning blir gjen-opprettet. such a large proportion of the tube jacket is stretched that the hardening of the contact knife is restored.
Dermed blir kontaktkniven anvendelig This makes the contact knife usable
selv for høye kontakttrykk. even for high contact pressures.
Claims (5)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NO16894867A NO120754B (en) | 1967-07-05 | 1967-07-05 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NO16894867A NO120754B (en) | 1967-07-05 | 1967-07-05 |
Publications (1)
Publication Number | Publication Date |
---|---|
NO120754B true NO120754B (en) | 1970-11-30 |
Family
ID=19910141
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
NO16894867A NO120754B (en) | 1967-07-05 | 1967-07-05 |
Country Status (1)
Country | Link |
---|---|
NO (1) | NO120754B (en) |
-
1967
- 1967-07-05 NO NO16894867A patent/NO120754B/no unknown
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